Index: /binary-improvements/webserver/js/index.js
===================================================================
--- /binary-improvements/webserver/js/index.js	(revision 175)
+++ /binary-improvements/webserver/js/index.js	(revision 176)
@@ -342,5 +342,9 @@
 			var r = L.rectangle(bounds, {color: color, weight: 1});
 			var m = L.marker(pos, { clickable: false, keyboard: false, zIndexOffset:-1000, iconSize: [0,0], icon: L.divIcon({className: 'invisIcon', iconSize:[0,0]}) });
-			r.bindPopup("Owner: " + playersMappingList[steamid].name);
+			if (playersMappingList.hasOwnProperty(steamid)) {
+				r.bindPopup("Owner: " + playersMappingList[steamid].name);
+			} else {
+				r.bindPopup("Owner: unknown ("+steamid+")");
+			}
 			landClaimsGroup.addLayer(r);
 			landClaimsGroup.addLayer(m);